CANTON, Mass. — The images that sell Reebok sneakers these days are edgy.

One ad depicts the devil. Another has fingerprints on what appears to be a police booking form, as rapper 50 Cent advises buyers to "take advantage of today because tomorrow is not promised."

A controversial television ad last year had 50 Cent, a former drug dealer who has rapped about being shot nine times, counting aloud the bullets that were fired at him. The rapper laughs and then looks into the camera as a voiceover asks, "Who do you plan to massacre next?" The ad was withdrawn in Great Britain.

Reebok's "I am what I am" campaign is a significant shift for the sneaker brand that first gained traction pitching subtly styled, lightweight shoes to American women who embraced the aerobics phenomenon of the 1980s.

These days, however, there's more money in selling to teenage males — a reality not lost upon Adidas-Salomon AG, which completed a $3.8 billion buyout of Reebok International Ltd. Jan. 31 and plans to keep the Reebok brand name alive. Reebok's profits rose more than 20 percent in both 2003 and 2004, and were up 37 percent through the first nine months of last year.

Adidas must now decide whether to stick with a marketing campaign that has yielded short-term sales gains among younger consumers. But the campaign is angering activists — although it has spurred no boycotts — and industry analysts say it also risks alienating customers who prize sneaker performance over fashion.

"Promotion and marketing footwear, or any clothing, is not, and must not be a moneymaking tool referencing gun violence, drugs or gangs," said Liz Bishop-Goldsmith, president of Rosedale, N.Y.-based Mothers Against Guns.

Reebok, which has also featured rapper Jay-Z, has gone further than market leader Nike Inc. and other rivals in embracing hip-hop culture and youth-oriented entertainment alongside athletics.

As the aerobics craze cooled, the brand expanded into basketball, football and other sports and signed endorsers like edgy basketball star Allen Iverson. Reebok's hip-hop foray began in 2002 with the street-inspired "RbK" line, and in November the company said it would begin producing Reebok-branded TV programs for a new Comcast Corp. on-demand hip-hop channel.

Reebok's chief marketing officer, Dennis Baldwin, said market research conducted after a late 1990s sales downturn revealed Reebok needed to retrench in response to a changing youth market.

"They weren't distinguishing between athletes and entertainers, and other things that were influencing youth culture," Baldwin said at Reebok's headquarters in Canton, 20 miles south of Boston. "So when we looked at the market, we said, 'Yeah, Allen Iverson is incredibly influential, but so is Jay-Z.' "

Reebok's "I am what I am" ads celebrate individual empowerment and overcoming adversity, Baldwin said. Alongside the bad-boy ads are some softer spots, including ads with actresses Lucy Liu and Christina Ricci.

Other Reebok endorsers have less-than-squeaky-clean pasts that might scare away other companies. 50 Cent, whose real name is Curtis Jackson, and Jay-Z have made no secret of their drug-dealing pasts or difficult upbringings. Jay-Z used his real name, Shawn Carter, for a signature line of Reeboks known as "The S. Carter Collection," which preceded 50 Cent's "G-Unit" line.

One of Reebok's newest endorsers is New York Yankees slugger Jason Giambi, who's been mentioned in court records as a client of a lab at the center of baseball's steroid scandal. The Congress of Racial Equality, a civil rights group, says Reebok promotes negative messages about black men.

"50 Cent was a drug dealer and proud of it," CORE spokesman Niger Innis said. "The fact that corporations are going to reward that kind of behavior is an outrage."